GE DS200GASQF1BGB  涡轮控制器 精密性高

GE DS200GASQF1BGB  涡轮控制器 精密性高

为什么汽轮机不能超速?

1)汽轮机在运行过程中，叶片所受的离心力和转速的平方成正比,即是说，转速虽然上升不大，但转子上所承受的离心力就成几何倍的增长，这在汽轮机设计的时候就考虑到的，所以超速现象对汽轮机是为危险的。

2）转机的转子在设计、制造过程中，都会有一个自身的自震频率，也就是我们冲转的时候要注意的临界转速所对应的频率。所以，汽轮机正常的工作转速都不在临界转速范围内。但当汽轮机转速超过工作转速，达到转子自身频率的两倍，这时机组的震动将大大增加，甚至比机组过临界转速的震动还要大的多，由于机组震动大所造成的动静部分的摩擦，使得机组震动继续，这就导致了一个恶性的循环。严重时，会使汽轮机彻底的报废。

如果是用于发电的机组，由于我国的电网频率定为50Hz，那么对应的，汽轮机转速也应该是3000rpm，如果机组不在额定转速下工作，那么将无法与电网并列运行。即使是孤网运行，如果频率升高，将直接导致转动机械的转速也对应升高，破坏电机的正常工作，造成泵或风机的出力异常增加，使电机发热，泵或风机震动，容易导致烧瓦事故。同时还会影响滤波器的正常工作，降低用电质量。

GE DS200GASQF1BGB  涡轮控制器 精密性高

Why can't the turbine overspeed?

1) During the operation of the steam turbine, the centrifugal force on the blade is proportional to the square of the speed, that is, although the speed does not rise much, the centrifugal force on the rotor will increase geometrically, which is taken into account when the steam turbine is designed, so the overspeed phenomenon is dangerous for the steam turbine.

2) The rotor of the transfer in the design and manufacturing process, will have a self-vibration frequency, that is, we should pay attention to the frequency of the critical speed when we rush. Therefore, the normal working speed of the turbine is not within the critical speed range. However, when the turbine speed exceeds the working speed, reaching twice the frequency of the rotor itself, then the vibration of the unit will be greatly increased, even more than the vibration of the unit over the critical speed, because the friction of the dynamic and static part of the unit vibration caused by the large vibration, making the unit vibration continue, which leads to a vicious cycle. In severe cases, the turbine will be completely scrapped.

If it is used for power generation units, because China's power grid frequency is set at 50Hz, then the corresponding steam turbine speed should also be 3000rpm, if the unit is not working at the rated speed, then it will not be able to run alongside the power grid. Even in isolated network operation, if the frequency increases, it will directly lead to an increase in the speed of the rotating machinery, destroy the normal operation of the motor, resulting in an abnormal increase in the output of the pump or fan, make the motor heat, pump or fan vibration, and easily lead to tile burning accidents. At the same time, it will affect the normal operation of the filter and reduce the power quality.

GE DS200GASQF1BGB  涡轮控制器 精密性高

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